<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">
<!--              {{this.$store.state.city}}-->
              {{this.currentCity}}-
            </div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item of hotCities"
               :key="item.id"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(item, key) of cities"
           :key="key"
           :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="city of item"
               :key="city.id"
               @click="handleCityClick(city.name)"
          >
            {{city.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'

export default {
  name: 'CityList',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    ...mapMutations(['changeCity']),
    handleCityClick (city) {
      // alert(city)
      // 参考：https://vuex.vuejs.org/zh/
      // this.$store.dispatch('changeCity', city)
      // 由于我们的数据不存在异步，批量的属性，因此可以直接调用commit,不需要dispatch这么麻烦
      // this.$store.commit('changeCity', city)
      this.changeCity(city)
      this.$router.push('/')
    }
  },
  watch: {
    letter: function () {
      if (this.letter) {
        // console.log(this.$refs)
        const element = this.$refs[this.letter.trim()][0]
        // console.log(element)
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color #ccc
  .border-bottom
    &:before
      border-color: #ccc

  .list
    overflow hidden
    position: absolute
    top 1.58rem
    left 0
    right: 0
    bottom: 0
    .title
      line-height .54rem
      background #eee
      padding-left .2rem
      color: #666
    .button-list
      overflow hidden
      padding .1rem .6rem .1rem .1rem
      .button-wrapper
        float left
        width: 33.33%
        .button
          margin: .1rem .1rem
          padding .1rem 0
          text-align center
          border .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        color: #666
        padding-left: .2rem
</style>
